cnntng the thoracic wall

• Pectoralis Major

  Origin: clavicle, sternum and upper six costal cartilage

  Insertion: lateral lip of the bicipital groove of humerus

  Nerve supply: Medial and Lateral pectoral nerves from the brachial plexus

  Nerve root: c5, c6*, c7*, c8*, t1

  Action: Adducts the arm and rotates it medially, clavicular fiber also flex arm
• Pectoralis Minor

  Origin: Third, Fourth and Fifth ribs

  Insertion: Coracoid process of the scapula

  Nerve supply: medial pectoral nerve from brachial plexus

  Nerve root: c6, c7*, c8

  Action: Depresses point of shoulder, if scapula is fixed, it elevates the rib of origin
• Subclavius

  Origin: first costal cartilage

  Insertion: Clavicle

  Nerve supply: Nerve to subclavius from upper trunk of brachial plexus

  Nerve root: c5*, c6

  Action: Depresses the clavicle, and steadies this bone during movement of the shoulder girdle
• Serratus Anterior

  Origin: Upper eight ribs

  Insertion: Medial border and inferior angle of the scapula

  Nerve supply: Long Thoracic Nerve

  Nerve roots: c5, c6*, c7*

  Action: Draw the forward anterior around the thoracic wall, rotates scapula